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  <title>Number of rows in a result</title>

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 <div class="refnamediv">
  <h1 class="refname">odbc_num_rows</h1>
  <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">odbc_num_rows</span> &mdash; <span class="dc-title">Number of rows in a result</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.odbc-num-rows-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">int</span> <span class="methodname"><strong>odbc_num_rows</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result_id</code></span>
   )</div>

  <p class="para rdfs-comment">
   Gets the number of rows in a result. For INSERT, UPDATE and DELETE
   statements <span class="function"><strong>odbc_num_rows()</strong></span> returns the number of rows
   affected.  For a SELECT clause this <em>can</em> be the number
   of rows available.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.odbc-num-rows-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">result_id</code></em></dt>

     <dd>

      <p class="para">
       The result identifier returned by <span class="function"><a href="function.odbc-exec.html" class="function">odbc_exec()</a></span>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.odbc-num-rows-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the number of rows in an ODBC result.
   This function will return -1 on error.
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.odbc-num-rows-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    Using <span class="function"><strong>odbc_num_rows()</strong></span> to determine the number of rows
    available after a SELECT will return -1 with many drivers.
   </p>
  </p></blockquote>
 </div>

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